Cut into squares/circles/hexes, match each into the comp live, vote the offset. Freeform-lasso a region to match just that. Same-source → exact lock; different images → similarity %.
backend: …
Element
draw a freeform lasso around a region
Tiled
matchedno matchdetail-skipoutside lasso
Hover a tile for its match; click for details. Drag the tiled grid onto the comp to snap.
Comp — target
Matched pixels light up here as it scans. Drop the tiled grid to snap; drop an image file to swap the comp.